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use num::One;
use simba::scalar::RealField;
use crate::base::allocator::Allocator;
use crate::base::dimension::{DimNameAdd, DimNameSum, U1};
use crate::base::{DefaultAllocator, MatrixN};
use crate::geometry::{TCategory, Transform};
impl<N: RealField, D: DimNameAdd<U1>, C: TCategory> Transform<N, D, C>
where
DefaultAllocator: Allocator<N, DimNameSum<D, U1>, DimNameSum<D, U1>>,
{
/// Creates a new identity transform.
///
/// # Example
///
/// ```
/// # use nalgebra::{Transform2, Projective2, Affine2, Transform3, Projective3, Affine3, Point2, Point3};
///
/// let pt = Point2::new(1.0, 2.0);
/// let t = Projective2::identity();
/// assert_eq!(t * pt, pt);
///
/// let aff = Affine2::identity();
/// assert_eq!(aff * pt, pt);
///
/// let aff = Transform2::identity();
/// assert_eq!(aff * pt, pt);
///
/// // Also works in 3D.
/// let pt = Point3::new(1.0, 2.0, 3.0);
/// let t = Projective3::identity();
/// assert_eq!(t * pt, pt);
///
/// let aff = Affine3::identity();
/// assert_eq!(aff * pt, pt);
///
/// let aff = Transform3::identity();
/// assert_eq!(aff * pt, pt);
/// ```
#[inline]
pub fn identity() -> Self {
Self::from_matrix_unchecked(MatrixN::<_, DimNameSum<D, U1>>::identity())
}
}
impl<N: RealField, D: DimNameAdd<U1>, C: TCategory> One for Transform<N, D, C>
where
DefaultAllocator: Allocator<N, DimNameSum<D, U1>, DimNameSum<D, U1>>,
{
/// Creates a new identity transform.
#[inline]
fn one() -> Self {
Self::identity()
}
}